Evolution of galaxy habitability
作者： R. Gobat , S. E. Hong
DOI: 10.1051/0004-6361/201628834
关键词: Galactic habitable zone 、 Kepler-47 、 Planetary system 、 Physics 、 Habitability of orange dwarf systems 、 Planetary habitability 、 Natural satellite habitability 、 Astronomy 、 Earth analog 、 Astrobiology 、 Astrophysics 、 Terrestrial planet
摘要: We combine a semi-analytic model of galaxy evolution with constraints on circumstellar habitable zones and the distribution terrestrial planets to probe suitability galaxies different mass type host planets, how it evolves time. find that fraction stars in their zone (known as habitability) depends only weakly mass, maximum around 4e10 Msun. estimate 0.7% all Milky Way planet within zone, consistent value derived from Kepler observations. On other hand, habitability passive is slightly but systematically higher, unless we assume an unrealistically high sensitivity supernovae. overall has not changed significantly last ~8 Gyr, most local disk having formed ~1.5 Gyr before our own solar system. Finally, expect ~1.4e9 similar present-day Earth have existed so far galaxy.
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